Serious question. Is this the norm at most NFL stadiums? Or is it something where Jerry was like, "It would cost waaay too much to have a proper drainage system, so let's just make this Emerald Point 2.0 in the case of a downpour."

I imagine the brass back in 1993 or whatever thought extreme weather would not be too common, so that's why it's designed this way. Yay global warming!!